V2 endpoint has limited API support and requires v1 for legacy protocols
7The Azure AD v2 endpoint only supports OpenID Connect and OAuth, excluding older protocols like SAML and WS-Federation. Additionally, only a small set of APIs are accessible (own API, Outlook, Microsoft Graph), requiring fallback to v1 endpoint for other APIs. No migration path exists for v1 applications.
compatibilityAzure AD v2MSALSAML+2